Transparent Plane with Screw Modifier
Alright, so I'm not entirely happy with this solution, but maybe I should be?
I've managed to work around it by.. enabling Backface Culling on the material:

I've been here before, but I also noticed that you can &quot;flip normals&quot; under the Screw Modifier:

Now I can duplicate the shape and remove the Screw Modifier:

.. and finally set the &quot;plane with the screw modifier&quot; as a parent object:


Setting it as parent isn't strictly necessary for the color part, but it makes it quite nice to scale and manipulate otherwise...

If anyone has a good solution that just uses the single object with the screw modifier, I would like to see that!
This feels quite hacky, but &quot;if it's stupid and it works, it's not stupid&quot;